Treść książki
Przejdź do opcji czytnikaPrzejdź do nawigacjiPrzejdź do informacjiPrzejdź do stopki
Exploitationisacontinuousprocesswheretheelementsofelectricinsulationsys-
temsareexposedtocomplexexternalandinternalstresses(includingmulti-stresses).
Followingthesynergylaw,themodelofthesimultaneousimpactofelectricalstressE
andthermalstressTisshowninFigure1.3.Thus,theconditionofinsulationsystems
inoperationisastatethatchangesundertheactionofoperationalexposures(inpar-
ticular,electricalandthermalexposures,andinsomecases,alsodynamicandenviron-
mentalones).
Fig01030Modelofexploitationofmulti-stressesonelectricalinsulation:
E–electricfieldstrength;T–temperature;tz–lifetime[FLOR16]
Thereliabilityofpowerequipmentdirectlydependsonthequalityandcondition
oftheinsulationsystemsinoperation;i.e.,theirenduranceandlifetimes.Inthesetof
operationalexposures,theactionofastrongelectricfieldanditseffectonthedielec-
tricstructuresinhigh-voltageinsulationsystemsisofparticularimportance.Theoper-
atingtimeofelectricaldevicesislimitedbydegradationprocessesintheinsulation
materials,causingchangesintheirstructures,permanentdamage,and(asaresult)the
failureofthesedevices.Partialdischargesarethephenomenathatcausethesepro-
cesses.Theireliminationininsulationsystemsisaprerequisiteforthetechnological
processes;theiridentificationinpowerequipmentoperationhelpsensurereliability.
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